has worked okay for 2/3 years however now jus sits there and hums no water in machine nowt going round just a hum is it because there is no water it don`t go? had a look and after taking out salt holder there is another sealed cylinder alongside it seems to have filters top n bottom and a load o brown stuff inside is this supposed to be there and if not how the heck do i get it out??? as it is a sealed unit and tho i have tried flushing it water does go thru eventually but the brown stuff stays put! HELP!!!!!!! plz 😕